Metal-treating container



Dec. 14 1926. I 1,610,385

G. s. MCFARLAND METAL TREATING CONTAINER Filed Jun 1'7 1925 Geo/ya 6 MFbr/0'0a' IN V EN TOR.

ATTORNEY Patented Dec. 14,

' '7 enonensmfirnnilann' or constants, 011 10.

e mnmanmnnnirine CONTA N R Applicationfiled il'une 1?,1925. Serial NamThis invention relates to "-metal' treating containers and isparticularly concerned With the; provision'of 1a containerof novel 1,

' construction for employment in the heat treatment of metals. Moreparticularly, thisinvention relates to e a container, which may be vusedin rectal treating processes Where high-temperatures are employed, a,typical illustration of which isthecementation 7 or carburizing process,wherein metals L areiheated to a high temperature in the presence 0fsome material Which supplies carbon to 1 the metal and results inimparting a very hard exterior shell or case to the metals tr eated.

Heretoiore, it has been :the practioe to pack the articles to betreatedin relatively,

thick metal containers ,Which are, usually of integral construction;The-great thickness scaling, oxidation and corrosion to which and Weightfoundnecessary to resist the these containers are subject and make themmo'redurable, necessitates'a longer time in processing, increased fuelconsumpt on and consequently an increase in the manufacturingcost ofthearticles treated. I

'One object of my invention is the provision of a container or shell forthe heat N treatment of metals designed to be positioned withinasupplementary containeror v basket; -This container or ishell may bemanufactured from anon-scanng, ;non-cori rodin'g i andnon-oxidizingrol-led or sheet 7 i' lmetalw-hich makes possible theuse'of con tainers or shells of thinner and-- lighter may terialgSuchacontainer or shell alsohas a much longerperiod of usefulness, islighter in Weight and therefore easier to handle and'store, requires;less time and fuel in heating, and is not 'subjelctflto cracking,

Warping 'or distor'tion. It furtherinsures a, better productbecause the,heat conductivity isuniform over-the entire surface and-is notvariable'because of the non-uniform. ,deposi-.

T j tation of refractory jscale over; parts of the a c ntaner J- J ,Afurtherobject of my invention the provisionofa basket or supplementarycontainer haying removable and replaceable members to fit therein tocontain the car burizing material and articles; to be treated";

The great temperature at which the car- I burizing process isconductedmay eat awayand disintegrate the shellsL-after "relatively"flSh'QIt periods ofservic e, but by ;prov1d1ng shown in Fi-gure.

'a permanent supplementary container or-p baskethavingremovable shellswhich-may be disposedfotvvhen they become unserv'ice able and replacedby new ones at a small icostfl greatly reduce the cost of maintaining'the equipment; The basket device does J not come 'into'contact withthe carburizing.

material andvtherefo r'e does not appreciably disintegrate or becomeothervvise unserviceable.-

Var ious; eother objects-oi invention Figure {L's a perspective vievvpa-rtly broken'away, showing the different parts of w my device inassembled, position:

will fbe apparent-as this descriiption pro- K 'gresses, and will bebrought out in, the claims appended'heret'o. The various ob- .jects ofmyinvention are preferably ob tained by[ the structure illustrated inf-theaccompanying drawings, ,Wherein, similar reference characters designatecorjrespQndqingpartsland Wherein y 1 FigureQ isa plan view ofthecontainer .Figure -3'-is an, elevation of the container .or shell'showninFigures 1 and 2. e I

1 Figure A; is aplan view :of the lidor'cove-r;

.Q'Figure 5'is arr-elevation the lid '01 cover rew to Figure-.1, myinvention isshownas -In' the drawings, andwith particular ref- 3,compris'ing the preferably open-ended tuba:

' shell or :'container 1-, which may be :of any de-; sired shape-dependingupon the articlesto be treated, -or :upon; the preferences ofthe user. f 1 This tube-:orshell member is desirably manu facturedifrom,relatively thin -rolled 'or sheet metal, andj-theqabutting edges;-united by I any suitablewmeans {'suchgas the-lapseam' shon,;vvhich"-may bejiso' for-medias taper mitthe' shipment ofthe'contain'er or shell a flat'position so as tooccupy less space andpermit aflarge numb-er tobepacked in one 7 jcontainerg- The-edgesmayf'be -united..:by; it its pressing, rolling, or any other suitable 7formed into any of the common shapes. and

a to, prevent;v This lid is intended to prevent 1 escape of gases duringthe heat treatment integral may be provided jwithan integral or attachedbase orwith a centralcore such as is commonly used in the treatment ofcertain articles. The material from which this contamer is manufacturedis preferably a nonscaling metal, such as chromium, nickel .or

chrome-nickel alloy which will not oxidize,

or corrode at the temperature of use, but for reasons hereafterexplained, a common rolled or'sheetmetal may be used. The heat resistingalloys have the advantage ofrbeing able to Withstand long and continuoususe without. appreciable deterioration; whereas.

common rolled or sheet metal is relatively cheaper and may beeconomicallyemployed due to the fact that'Ihave provided a per- V manentba'sketor supplementary container which is not subject to deteriorationand in which thecontainers or shells may be placed.

Thecontainer 1 is shown mounted in the basket or supplementary containerQwhich maybe formed with thelegs 3 and preferably open-work or retiformbottom 4. The

vertical ribs5 may be encircled or connected by one or nore members 6'to retain the' shell or container .ll'andprevent distortion thereof. Theretiform' or open-work con-- str'uction of the sides andbottom permitthe heat to have easy access to the relatively thin containers.

most indefinitely. 7 7 It will be understood that this basket may befabricated in anydesired shape andfrom; any suitable" material and thedesign and proportlons of its various parts'may be varied extensively"butall such. modification are within'the scope of my invention: Thisbasket or supplementary containeris pref, oerably formed of'some heatresisting metal such' as tthe alloys of" chromium, nickel, chromenickel, etc.,' and may be cast one piecesJ H r 1 V A lid or top 7, shownin Figures 1,74 and 5, is intended to, loosely interfit with the{container and nay' be luted thereon-by clay I 'or other suitable lute;This cover is preferably formed to permit of'the alternate use of itsopposite'sides adjacent the interior of {g -the container to therebyavoid Warping 6 which the ribbed construction will also tend since ithas ,been "found that such gases when" confined within the containerwill expedite the treating process; .Thislid also basket will last al- Wpiece or built up of one or more iznw which would probably oxidize anddetrimentally affect the objects beingtreated.

has the further purpose of excluding air,

The particular form of lid shown or the method of sealing is" notintended as a limitation of the use of my invention as other 7 methodsof sealing are in common use and may be'employed, andstill retain thefundamental principles of my invention;

In use, the various partsare assembled, as shownv in l igure 1. A bottomplate 8 rests loosely upon the open-work bottomfofl the basket 2, thecontainer or shell 1 is positionedwithin the basket or supplementarycontainer and rests upon the bottom plate 8 to which it maybe lutedr Thelid 17 is j positioned upon the top of the shell or container. Byproviding the supplementary container 2 with'a so'lid instead ofretiform bottom, the bottom plate 8 may be'dispensed with.

This arrangement providesa'very';

compactand easily disassembled structure wvith which containers ofordinary sheet metal may. be used and economically re-,

placed, or containers of heat resisting metal used to obtain theobjectsheretofore discussed. i 1

From the preceding'description, it will be obvious that'I have produceda container for the heat treatment of metals which may be cheaplymanufactured from thin, light.

rolled metal of a quality toresist scale, oxidation and corrosion and a,container which will outlast many of the ordinary variety if the heatresisting metal'container or shellis used, or if a container of'ordinary. rolled metal is; usedfit makes possible .the economicalreplacement thereof after a 00m:

paratively short period of service. The dc} I vice is li ht in weight,easily handled and stored, requires less fuel for a given treatment,fewer laborers are required to'handleit,.the-heat conductivity isuniform over the entire surface, the initial cost'is 'less than-v' forother containers, the treatment is eXpe-j dited, and the productimproved in" quality because the elimination-"of unknownfor variablevalues makes possible. better control of the treatment, finally the costof the treating'process isreduced. The term heat treatment as usedinthis specification comprehends such processes or operations as carbon'izing, eementation, annealing, malleableg. .t l i employed 111 thetreatment OI metals. i

I claim is: i

, Having thus described my invention, what etc, wherein hightemperatures are; 7

*1. Ina carbonizing vessel, .a frame-of mafterial resistant to heat,'i'and a removable;

latter-being adaptedto be re'placedwhen 11 has become useless w thoutreplacement of 7 container -mounted Within said frame, the

the-said frame.

2. A] earbonizingfi vessel comprising a 5 frame made ofa materialresistant" to and s ubsta'ntial lyunaffected by hightemperw. peratures,and .a removable container} bf I tures, and afiremovable containermounted sheet metal mounted Within-said frame, the 1O Within said frame,the latter being made of latter being made'of a metal non-resistantto a,material'non-resistant to and readily emfand readily aflfected by hightemperatures.- fected by high temperatures. 7 v In testimony'whereof, Ihereby aflix my 3. A carbonizing vessel comprising a bas-' signature. fV '1 I i ket-like framemade of a metal resistant to jandfsubstantiallyu'nafiectedby high -tem- 'i I GEORGES; MCFARLAND;

